Precision tool



March 13, 1934. E. J. SCHERER PRECISION TOOL Filed Jan. 29, 1931 7. 1,1 #4 W nnoo I 6 w H 4, M J gl/HAAAAAAAAAAAAAANAAAR E Patented Mar. 13, 1934 PRECISION TOOL Edward J. Scherer, Pueblo, 0010.

Application January 29, 1931, Serial No. 512,173

1 Claim.

The invention relates to precision tools of the caliper type and has for its principal object the provision of a tool consisting of a pair of pivotally connected legs, and providing on one of said legs an adjustably extensible member so mounted as to provide an extension for the leg and having on its outer end an integral sleeve on which is adjustably mounted a pointed rod, said adjustable members adapting the tool for use as a marking gauge in addition to its use for inside and outside measuring.

A further object of the invention is the provision of a tool of the character stated that is reasonable in cost of manufacture, that is light in weight and is thoroughly practicable in use by skilled machinists and others.

The invention will be described in detail hereinafter and will be found illustrated in the accompanying drawing, in which Figure 1 is a side view in elevation of the improved precision tool,

Figure 2 is a fragmentary longitudinal sectional view on an enlarged scale on the plane indicated by the line 2-2 of Figure l,

Figure 3 is an edge view in elevation of the extensible unit, and

Figure 4 is a transverse sectional view on a plane indicated by the line 4-4 of Figure 2.

In the drawing similar reference characters 0 are used to designate corresponding parts in all the views.

The improved precision tool is, as hereinbefore stated, of the caliper type, and comprises two legs 1 and 2 respectively that are pivotally connected 5 as shown at 3. The leg 1 has its free extremity tapered and turned laterally as shown at 4, while the leg 2 is provided with a longitudinal groove 5 intersecting the free end of the leg, and a longitudinal slot 6 through the base wall of the groove 5. A bar '7 is slidably mounted in the groove 5 and provided with a threaded pin 8 extending through the slot 6 to receive a clamp nut 9 and a washer 10 to hold the bar '7 in adjusted position relatively to the leg 2 and slidably adjusted in the groove 5. The outer end of the bar 7 is provided with an offset sleeve 11 having a longitudinal bore 12 therethrcugh to receive a rod 13, and a threaded bore 14 arranged transversely to the bore 12 and intersecting said bore to receive a clamping screw 15 to hold the rod 13 in adjusted positions relatively to the bar '7. The outer end of the rod 13 is tapered to a point as shown at 16.

In practice the parts 1, 2 and '7 may be manufactured of low carbon steel, while the rod 13 is preferably made of high carbon steel that will take and hold a point, as shown at 16, so that the tool may be used as an inside or an outside caliper, and also as a marking gauge, and be cause of the extensible bar 7 and the extensible rod 13 the tool is capable of a wide range of use, not only as a marking gauge but also as calipers.

What is claimed is:-

A precision tool of the character described, 0 comprising two legs pivotally connected, one of said legs having a longitudinal groove therein and a longitudinal slot in the base wall of said groove,

a bar slidably mounted in the groove and having a threaded pin integral therewith and inserted 35 through said slot, a clamp nut engaging said pin to hold said bar in adjusted positions on said leg,

an integral sleeve on said bar, a pointed rod slidably mounted in said sleeve, and a set screw engaging a threaded opening in the sleeve to engage the rod and hold it in adjusted positions in said sleeve.

EDWARD J. SCHERER. 

